Nut



Mai 8, 1934- R. L. wn coxl 1,957,923

NUT

Original Filed May 24, '1952 ATTORNEY Patented May s, 1934A PATENT ori-ICE UNITED STATES NUT Richard. Lester Wilcox, Waterbury, Conn., ati signor to The Waterbury Farrel Foundry and Machine Company, Waterbury, poration of Connecticut Conn., a cor- K' original application Mayv 24,` 1932, serial No.

613,208. Divided and this application November 3, 1932, sei-iai No. 641,06@

s claims.v (ci. ss-czi about May 24, 1932, and designated by the Serialy Number 613,208. It is the object of this invention, among other things, to provide an article of manufacture of the character mentioned, which will be much more homogeneous, stronger and tougher than any such article heretofore produced, and in which there will be the maximum resistance to the stripping of the threads.

I have discovered that by controlling the grain structure of the nut so that it does not extend in a straight line, either parallel to the height of the nut or at a right angle thereto, stripping of the threads is resisted. This is due to the fact that the force exerted on the threads is atan angleto the axis of the nut, as distinguished from a nut having a grain structure wherein the pull on the threads is parallel to the grain.

Referring to the drawing, in which like numerals of reference indicate like parts in the several figures;

Figure l is a sectional view of a blank, illustrating the grain structure thereof;

Figure 2 is a similar sectional view of the blank after being shaped into a substantially globular or similar formrg.

Figure 3 isa similar sectional view of the blank after a succeeding pressureoperation and formed into its substantially finished shape, with a countersunk depression in each of two opposite faces thereof;

Figure 4 is a view, partly in section, showing the blank at the completion of the piercing operation, Awith the tools therefor in their related position; and

Figure 5 is a sectional view of the completed threaded n ut.

In proceeding in accordance' with the present invention, a blank l as illustrated in Figure l is cut from a rod and subsequently, if deemed advisable, some of its corners may be relieved, as

shown at the bottom in said figure. The grain of this blank is substantially parallel with the length thereof.

By compression the blank 1 of Figure 1 into the substantially globular form or the like,vas shown in Figure 2, the grain structure bulges outwardly toa pronounced degree from the longitudinal center of the blank. 'I'he blank, as so formed, is then subjected to further pressure and the article, in substantially its completed exterior form (Figure 3) is produced with depressions 3, or the like, in opposite faces thereof with outwardly flared bounding walls. A relatively thin web 4 is thus produced at the center of the blank, with a grain so distorted as-to produce a comparatively weak structure, while otherwise the grain structure of the globular form blank is definitely maintained.

' The blank is then placed on a die 5 and a piercing punch 6 is projected through the web 4 to form the hole '1. The slug 9 produced by this piercing operation, shown in broken lines in Figure 4, escapes Afrom the die through the opening therein. 'I'he piercing punch 6 may be of less diameter than the bore of the die 5. It hasl been determined that a registry between the punch and the hole of the die, as in the present practice, is not necessary, due to the blank being densifled or hardcned to eilect a grain structure outside of the web 4 andthe latter b'y its grain structure weakened, substantially as illustrated.

With soft metal not treated in accordance with the instant invention, the'practice of substantially uniform diameters of the punch and hole of the die, and attendant tedius manipulation in effecting accurate registry is eliminated. The nut is completed by forming a thread 8 in the hole '7.

Through actual tests it has been demonstrated that nuts possessed ofthe grain structure of the present invention are stronger than nuts manufactured in accordance with the present day prac` tice. The pull or force exerted on the threads bythe threaded bolt tending to strip the nut thread is definitely and positively resisted by the angular relation between the grain and the lines of force.

What I claim is:

l. A pressure formed nut having its grain ex- 3. A pressure formed nut having its grain ex-' tending in irregular waves in the same general direction as the axis of the nut, the waves adjacent to the wall ofthe opening in the nut being curved with the opposite ends thereof terminating at said wall.

RICHARD LESTER WILCOX. 

